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Printing fault and countermeasure

2016-01-14

problem	phenomenon	Reason	countermeasure
From the dirty	In the dirt and part produced light, not from the version of dye, so water sponge can wipe the dirt	Ink viscosity is too small, the transfer of pigment capacity is poor; ink binders resistance is not strong; pigment hydrophilic strong; pigment in ethanol infiltration; fountain solution acid is too large; fountain solution from the paint on the absorption of the emulsifier. To note version of ink emulsification liquid, as oil in water (O/W) emulsion.	In the ink join high viscosity and good water resistance of inking oil or gel inking oil, to improve the ink flow of life; choose strong lipophilic and ethanol tolerance of pigment ink formulation, replacement of high viscous and difficult to ink emulsive, check the fountain solution of pH value, fountain solution of acid base regulation suitable; replacement of paper of the dampening liquid supply quantity is reduced.
Dirty	The printing ink on the stack attached at the back of overlapping print, the print.	Ink on paper sessile or drying too slow; give too much ink, ink layer is too thick; solvent in the ink penetration is too slow or boiling point petroleum solvent too much; delivery at excessive accumulation; dusting spread bad dusting or insufficient; paper of oil absorption.	Add appropriate amount of driers; is heated by a heater, to speed up the ink fixing speed; with a thick ink or a high concentration of ink thin printing; control the spraying uniformity and increase the amount of powder injection; reduce paper stacking height; adjust paper collecting mechanism and reduce the slip of paper; check and replace the paper
crystallization	In multi-color printing, in front of the printing ink to dry, will be a color overlap printing in the above, ink is not uniformly adherent go up, or even part attached to the top, but the rub or scrape easily peeling off	First printed ink fixing too fast and crystallization, after China and India ink to be adhesion; ink dryer agent too much, drying too fast; from the overlay printing time interval is too long; front printing ink containing the wax additives, in the drying process floating ink membrane surface; front printed when excessive amount of powder injection, influence behind the overprinter; the use of the low oil absorption paper.	In printing ink added strong solvent to soften ink film and improve its adhesion; as it happened with the print of the crystallization of soft cloth to wipe, printed at the back of the ink; slow down first printing ink drying rate, and strictly control the overprint interval; reduce the amount of wax additives, using the minimum required limited; printing space walk again, with an infrared lamp appropriate heating make wax softening; front printing to reduce the amount of powder injection; update the absorbent paper.
Plugging ink	Transfer printing ink from the ink to be a roller	Ink yield value is too large, poor liquidity; thixotropism is too large, the formation of colloidal state of agitation; short ink drawing.	High viscosity ink mixing, extra oil increase, increase the ink liquidity; continuously stirring ink fountain to the ink, or a stirrer is arranged in the ink fountain.
Text hair thick	The printing and graphic dot becomes thick and dense, white point map part	The ink is too thick; the ink is too soft; the printing pressure is too large; the pH value of the fountain solution is not appropriate, the water supply is too low; the printing environment temperature is rising.	Ink with high concentration of thin printing; ink is tough and elastic, add high viscosity adjusting ink based gel ink transfer; with a required minimum of printing printing pressure; appropriate adjustments to the fountain solution of pH value and increased water; adjust the printing environment temperature.
Drying rate	Ink tank or reservoir ink in ink surface to form a dry coating, ink roller and a printing plate and blanket, and so on surface drying; viscous ink gradually increased, resulting in a bit of paper and ink transfer malnutrition and ink uneven.	Ink driers too much; ink solvent used low boiling fraction slants much, solvent evaporation or ink absorption; roller pressure is too large, resulting in friction produces too much heat; printing environment of high temperature or humidity is low.	Replacement of drying rate of the appropriate ink; addition of alkyd resin and on stability of ink roller ink viscosity; add drying inhibitor (anti skinning agent); add slow volatilization of solvent to adjust the ink drying performance; adjust the ink roller pressure to reduce friction force; improve printing environment temperature degree (preferably 25 DEG C plus or minus 1 degree Celsius) and humidity (best 65% + 5%).

Printing failure is caused by various reasons, such as printing machine (machine precision, printing pressure, printing speed, etc.), printing supplies (paper, PS version, printing ink, fountain solution, etc.), the operator (proficiency, responsibility, etc.) and the printing environment (temperature, humidity, etc.), the operator should according to the generated problems were analyzed and the corresponding to the solution, or contact with suppliers.